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Jimps (serrations)-pretty much individual preference. I prefer them over a smooth shank.
Schorkopf-kind of a beveled toe. Sort of like this:
281168

Again...mostly aesthetics and individual...

281164
281165

I have six...all 6/8 or 7/8
Each is a truly fine razor. All were pretty much shave ready right out of the box. I believe Ralf Aust makes the finest production razor on the market....